The keynote

Tim
Burke started the DevConf 2016 by a keynote full of tips how to become a
rock star in open-source world. From "not being a troll", through "not
doing what you don't like", to be a real team player, because a rock
star is not an individual. Passion was identified as a way how to enjoy
your work. See the full keynote at
https://www.youtube.com/watch?v=Jjuoj2Hz03A.

Docker versus systemd

Dan
Walsh talked about systemd and docker integration. He mentioned
pitfalls they have already solved and which they still need to solve.
Dan himself staying in the middle of docker upstream and systemd guys,
who both don't like accepting compromises. He mentioned these issues:

sd_notify that should eventually help notifying about app readiness

logs being grabbed by journald so the logs are available after container is removed

running systemd in docker container - all PRs closed by docker

with docker 1.10 it will work with some options specified during container start

machinectl, working with all VMs running on machine

eventually libcontainer will be hopefully replaced by its clone runc, from OCSpec

All Flavors of Bundling

Vit
talked about practical examples of bundling he met during ruby
maintenance work, mentioning bundler not only because it helps bundling
stuff, but also because it bundles a lot of stuff. He mentioned that
there might be some reasons to bundle, sometimes not. All that was
triggered by recent change in fedora guidelines, that start to allow
bundling. Vit also went through various specifics in different
languages, like javascript, c++, go, ... interesting point about
generators, he said that we basically bundle the code because if they
make mistake, you get problem.Q: some example of bundling that succeeded? Bundler project learned that bundling is the correct way and the only way.

Open source distributed systems at Uber by Marek Brysa:

HA is really crucial, because payment transactions and tracks are done by Uber.More services than transporting people - food, stuff and even kittensTechnologies used: Ubuntu, Debian, docker, python, nodejs, go, kafka, redis, cassandra, hadoopEvery project meant to be open-sources by default, except exceptionsAlso contributionsUmber of micro-services grew from 0 to 700 micro-services in last two yearsRingpop:

consistent
hashing for sharding, membership protocol - SWIM membership protocol,
using direct and indirect pings to get state of an instance, to prevent
random network issues

Apparatus called gossiping says something about other instances when sending a message

Infection style of dissemination, currently 1k instances, 2.5k tested, in the future 10k?

App level middleware

TChannel:

Soa oriented replacement of http, which turned to be slow in some cases

Services are connected to ring of routers, every service is connected to few routers

CI/CD with Openshift and Jenkins:

It is not only about toolsContainers as cows, we replace one if dies.Containers make people think about what happens when a container diesOpenshit CI/CD wants to be generalized to pipeline that may be used by other projectsExample of running Jenkins in OpenShiftS2I used as configuration toolhttps://github.com/arilivigni/openshift-ci-pipeline - 3.3 openshift release roadmap

Is it hard to build a docker image?

Tomas asked and had also answer that it is..Squashing, cache, secrets, adding only (metadata), usage message, evolution is rapidConclusion is that docker is young

Remi's PHP 7:

Reason for skipping 6 was existence of books about development version 6New API brings binary incompatibility for binary extensionsChange in size_t and int64 only on windowsAbstract syntax tree, native TLS, expectations (assert finally usable), throwable interfaceExtensions porting process still in the middle, some won't ported at all, MongoDB for instance instead of mongoPerformance increased twice for common applications, comparing number of pages servedScalar types possible to be defined in functions declaration, strict_types option makes strong typed language from phpWe now can catch parse and type errors, with keeping backward compatibility of exceptions still workingRemoved extentions, change in expressions containing variable names in other variablesFedora will eventually drop incompatible extensionsWe need scls in fedora, that would be the best thing for php7

Security: Everything is on fire!

Josh
Bressers talking about security and whether the situation is really
that desperate. It is not yet, but there is work to be done. What is
happening is people earn real money on security issues, press makes
money on newspaper selling, so they make up things to sound interesting.Where do we start? Communication is key. Security guys should listen.Security is not here for solving problems, it is part of the problem.

Centos pipeline meet-up:

Couple
of people in one room had an initial chat about existing components
that should be usable for CentOS Container Pipeline and decided to use
Openshift, which sounds like good way to go because it includes already
the missing pieces.

Fedora and RHEL:

Denise was speaking about how fedora is important for Red Hat.Matt
then presented a lot of graphs about downloads stats of fedora from
various views. The impression was that it is not that bad.

Changing the releng landscape

Denise Gilmore about releng in fedora:Koji 2.0 still in the beginning, should be build with copr backend somehow, to allow more flexible buildsEt/bodhi alligmentRpmdiff and license scanning done internally shoud be done in fedora as well.

Re-thinking Linux Distributions by Langdon:

Rings concept did not workIt was too complicated when working out the detailsModularity should work betterThink about applications, not packages setsWe need minimize dependencies on other applications and on OSGive separate channel with metadata, that's what rpms were invented forAtomic app, nulecule, rolekit, xdg-app mentioned as wayE&s is where the definition should take place, not necessarily place to code itQ: will 10 versions of library do a mess in systems? Let's make computers track that for users

Q&A with council:

included
question that cannot be missed in any similar session - fedora and
proprietary drivers. Josh mentioned that the problem is not only getting
the drivers installed, but also not breaking the whole video once
kernel is updated. Everybody understands the politic cannot be easily
changed, but atleast the problem with breaking the video might be better
soon. Another question questioned matt's graphs, there was a question
about possible kerberos inclusion instead of generating certificates on
server, where there is btw a privat key, which doesn't belong there.
Generally the session was very positive.

Closing quiz:

The last session, the quiz, which full room was participating in, was funny and interesting end of the conference.